KR102100516B1 - Device and method for machining bevel gears using an eccentrically moved grinding tool - Google Patents

Abstract

The present invention includes a workpiece spindle 21 for mounting the bevel gear workpiece 31, a tool spindle 42 for mounting the grinding wheel 24 provided with a polishing surface 28.1, and a bevel gear workpiece 31. It relates to a device 20 having a plurality of driving parts (B1, B2, B3) for processing. The grinding wheel 24, during processing of the bevel gear workpiece 31, performs rotation about the rotation axis R1 of the tool spindle 42 and the grinding wheel 24 is used to remove the material from the bevel gear workpiece ( 31). An eccentric movement E is added to the rotation about the rotation axis R1 of the tool spindle 42, so that the grinding wheel 24 is only a bevel gear workpiece 31 in n contact areas of the abrasive surface 28.1 Interlocks. The apparatus 20 is designed to enable adjustment of eccentric motion to specify m contact areas of the abrasive surface 28.1 in the range of the further processing step (II) after the first processing step (I), m contact areas Does not overlap n contact areas.

Description

DEVICE AND METHOD FOR MACHINING BEVEL GEARS USING AN ECCENTRICALLY MOVED GRINDING TOOL}

The present invention relates to an apparatus for processing a bevel gear using an eccentrically moved grinding tool.

It is known that bevel gears can be machined using grinding tools. So-called cup-shaped grinding wheels are often used in these cases.

So-called discontinuous profile grinding is a grinding process according to a single indexing method. In particular, discontinuous profile grinding is used to fabricate plunged crown wheels. During plunging of the cup-shaped grinding wheel, the profile of the cup-shaped grinding wheel is imaged with the material of the crown wheel to be fabricated. In addition, this method is also called an index formation method.

While grinding a bevel gear with a helical tooth, the concave tooth side of one tooth gap is made using the outer peripheral surface of the cup-shaped grinding wheel and the convex tooth side of the tooth gap is made using an inner peripheral surface. If this is done in two side cuts, also known as the usual completing in the case of plunge grinding of crown wheels, both tooth sides of the tooth gap are ground simultaneously. On the other hand, in one side grinding, only the concave tooth sides of the tooth gap or only the convex tooth side are ground.

The large contact surface over the entire tooth width of the work piece causes plunge grinding of the helical bevel gear in this case. At this time, the cooling liquid cannot reach the grinding area. Due to the large contact surface and lack of cooling, so-called grinding losses can occur on the tooth sides of the workpiece. In addition, problems may arise in chip removal and the cup-like grinding wheel may be blocked with metal particles.

It is known that the plunging motion of the grinding wheel can have an eccentric assist motion of the added grinding wheel center point, thereby solving the problems mentioned or reducing their influence on the grinding process. Due to the overlap mentioned, the cup-shaped grinding wheel center point moves on the trajectory around the center point. The radius of this trajectory is specified by the eccentric stroke and is smaller than the radius of the cup-shaped grinding wheel. Because of this movement, the cup-shaped grinding wheel will only contact the workpiece at one point, which is considered geometrically, but in practice it is a locally delimited area that occurs due to the feed movement. The ratio of the eccentric speed to the speed of the cup-shaped grinding wheel is called the eccentricity.

Eccentric auxiliary motion can be made on grinding machines by setting each of the eccentricity or eccentric speeds in the form of a fixed specification.

Undesirably large surface contact between the grinding disc and the crown wheel can be avoided by eccentric motion. Details of the superposition of the circular eccentric motion can be deduced, for example, from published applications DE 2721164 A and DE 2445483 A in Germany. Clearly, the principle of the eccentric movement comes from the inventor Waguri, who made developments corresponding to 1967.

Figure 1 (a) shows a schematic view of the so-called Waguri approach, where the cup-shaped grinding wheel 2 is a small distance e with respect to the center point M2 of the Waguri wheel 3 (waguri Rotation around the wheel center point M1 offset by the eccentric). The eccentricity is defined as the eccentric speed divided by the speed of the cup-shaped grinding wheel 2. The cup-shaped grinding wheel 2 rotates at an angular velocity ω1 about the center point M1. The eccentric motion causes a circular motion around M2 with respect to the center point M1 of the cup-shaped grinding wheel 2. This circular motion has motion components in the x and y directions.

For other constant ratios, the frequency of contact of the cup-shaped grinding wheel 2 with the tooth side, the location of this contact area on the cup-shaped grinding wheel 2, and the concave and convex tooth sides in the case of two side cutting. The phasing of the contact and its possible movement on the cup-shaped grinding wheel 2 depend on the eccentricity selected.

For example, the contact between the cup-shaped grinding wheel 2 and the concave side 5.1 of the tooth gap 5 in the case of an eccentric rotation angle of 0 ° (the 0 ° position here coincides with the y-axis) is one. Assuming that it occurs in the region 4 (see Fig. 1 (a)), accordingly the convex side of the cup-like grinding wheel 2 and the tooth gap 5 after an eccentric rotation of 180 ° (Fig. 1 (a)) At, the convex side of the next tooth gap will be indicated by reference number 5.2).

If the eccentricity rate is 1, the eccentricity is rotated once during one rotation of the cup-shaped grinding wheel 2. The cup-shaped grinding wheel 2 makes a single contact (at 0 °) to the concave side 5.1 of the tooth gap 5 during each full rotation and once (at 180 °) to the convex side of the tooth gap 5 do. Contact always takes place in the same area. If the eccentricity is 2, the cup-shaped grinding wheel 2 with the concave side 5.1 of the tooth 5 (at 0 ° and 180 °) or with the convex side of the tooth 5 (at 90 ° and 270 °) Two contacts of occur during one full revolution of the cup-shaped grinding wheel 2. At an eccentricity of 0.5, the concave side 5.1 is contacted at 0 ° and 720 ° and the convex side is contacted at 360 ° and 1080 °. Each of these angular specifications relates to the fixed coordinate system of the cup-shaped grinding wheel 2 and in the three specific cases mentioned there is no movement of the contact areas along the circumference of the grinding wheel 2 from the full rotation to the full rotation.

However, in general, the movement of the contact area on the cup-shaped grinding wheel 2 occurs per revolution, so that the entire grinding wheel periphery is used for grinding the workpiece 1. In addition, the predetermined eccentricity may be a rational number (Q). The actual example is an eccentricity of 0.7. In this case, the contact of the concave side 5.1 occurs at 0 ° and 514.2857 ° (corresponding to 154.2857 ° on the grinding wheel circumference) and the convex side contact is 257.1428 ° and 771.4286 ° (corresponding to 51.4286 ° on the grinding wheel circumference) Takes place in If the cup-like grinding wheel 2 performs a plurality of forward rotations, the contact areas are increasingly moved and eventually the entire grinding wheel circumference on the profile 8 is used for grinding.

1 (b) shows a cross section through a portion of the cup-like grinding wheel 2 along line X1-X1. The profile 8 of the cup-shaped grinding wheel 2 can be seen in Fig. 1 (b).

Due to the added eccentric motion, the entire surface of the concave side 5.1 of the workpiece 1 and the outer surface 8 of the profile 8 of the cup-like grinding wheel 2 and the profile 8 of the cup-like grinding wheel 2 (Excessively) large surface contact between the inner peripheral surface 8.2 and the entire surface of the convex side is avoided.

For details on grinding methods with added eccentricity, see, for example, the document "Guidelines for Modern Bevel Gear Grinding" by HJ Stadtfeld, revised May 2008 by Gleason Works, USA. This is explained on page 15.

Grinding wheels are hereinafter referred to in general, but in specific cases these are mostly cup-shaped grinding wheels.

Nevertheless, studies have shown that grinding splints can be formed on eccentrically mounted grinding wheels according to the waguri approach. In addition, these eccentrically mounted grinding wheels may still be blocked with metal residues. In addition, these grinding wheels may have insufficient service life.

Accordingly, the present invention is based on the object of providing an approach that makes it possible to further improve the use period of such eccentrically mounted grinding wheels.

This object is achieved according to the invention by means of the device according to claim 1 and the method according to claim 12.

For this purpose, a device spindle is used for mounting a bevel gear workpiece (preferably a spiral bevel gear workpiece), a tool spindle for mounting a grinding wheel, and a device equipped with a plurality of drives for machining a bevel gear workpiece is used. In that respect it is achieved according to the invention. During machining of the bevel gear component, the grinding wheel performs rotation about the axis of rotation of the tool spindle and the grinding wheel engages the bevel gear component to remove material. Eccentric movement is added to the rotation about the axis of rotation of the tool spindle, so that the grinding wheel does not continuously remove material along the entire concave and / or convex sides using internal and / or external abrasive surfaces, but rather intermittently and It is only engaged with the bevel gear workpiece at n contact points (n ∈ Q) of the entire circle of grinding surfaces.

The present invention is designed to enable the apparatus to adjust the eccentric motion to specify the contact points of m (at this time, m ∈ Q) of the entire circle of the grinding surface of the grinding wheel in a range of further processing steps after the first processing step. , m contact points are distinguished in that they differ from the n contact points by an angular distance. The m = n condition is generally applied.

According to the invention, the angular distance always relates to the grinding wheel, ie the angular distance is set in the coordinate system of the grinding wheel. The coordinate system of the grinding wheel is fixedly connected to the grinding wheel and rotates with the grinding wheel about the axis of rotation of the grinding wheel. Further, the setting of n and m contact points relates to the grinding wheel.

When so-called contact points are referred to herein, it should be considered that these contact points are geometrical values obtained from theoretical computational observations. However, in practice, the contacts between the grinding wheel and the work take place in so-called contact areas, where the contact areas are defined as respective contact points.

According to the invention, the angular distance is selected such that the angular (uniform) distribution of all contact areas occurs continuously over the entire circle of the outer and inner abrasive surfaces of the grinding wheel. That is, the (uniform) distribution of all contact areas is fixedly connected to the grinding wheel.

In order to be able to perform angular uniform distribution monitoring, each angle (stroke angle) at which the grinding wheel comes into contact with the material of the bevel gear workpiece must be fixed relative to the grinding wheel.

In other words, other stroke points are set for the grinding wheel during the first machining step than in the further machining step.

Other preferred embodiments can be deduced from the dependent patent claims.

According to an apparatus and method for processing a bevel gear using an eccentrically moved grinding tool according to the present invention, there is an effect that prevents grinding loss of eccentrically mounted grinding wheels and further improves movement safety and service life .

Exemplary embodiments of the present invention will be described in more detail below with reference to the drawings.
1 (a) shows a schematic view of a cup-shaped grinding wheel mounted eccentrically in a known manner on a waguri wheel and processing a tooth gap in a crown wheel workpiece;
Fig. 1 (b) shows a schematic cross-sectional view of a portion of the cup-like grinding wheel along the line X1-X1 in Fig. 1 (a);
2 shows a schematic view of a portion of a grinding machine according to the invention with a cup-shaped grinding wheel rotatably mounted on a tool spindle and a bevel gear workpiece to be machined rotatably mounted on a workpiece spindle, wherein the cup-type grinding wheel and The bevel gear component is not engaged at the moment shown;
3 shows a grinding machine according to the invention with a cup-shaped grinding wheel in a partial section rotatably mounted on a tool spindle and a bevel gear workpiece rotatably mounted on a workpiece spindle (here a pinion with a spiral tooth) It shows a schematic detail of a part, the cup-shaped grinding wheel and the bevel gear workpiece being engaged at the moment shown;
Figure 4a shows a schematic view of a grinding wheel that is eccentrically mounted and comes into contact at two fixed (stroke) points with the material to be machined per full revolution in case of one side cutting in the first machining step according to the invention ;
Fig. 4b shows a schematic view of the grinding wheel according to Fig. 4a in contact with two different fixed (stroke) points of the material to be machined per full revolution in case of one side cutting in the second machining step;
5 shows a schematic view of the cup side of a grinding wheel mounted eccentrically and subdivided into a plurality of arc segments according to the invention, each arc segment having a (stroke) point;
Fig. 6 shows a schematic view of the cup side of another grinding wheel, which is eccentrically mounted and divided according to the invention into six arc segments each having one (stroke) point, the arc segments being spaced apart from each other;
7 shows a schematic view of the cup side of a grinding wheel mounted eccentrically and divided into a plurality of arc segments for roughing and finishing according to the invention;
Figure 8 is a schematic series of moments for a schematic grinding wheel mounted eccentrically and having two contact points according to the invention and used in one side cutting (where circular eccentric motion is replaced by simple vertical motion) The figures A1 to A7;
9 shows a schematic side view of a cup-like grinding wheel with a plurality of contact points on the outer periphery of a profile according to the invention, mounted eccentrically and used in one side cutting, two of which are shown;
10 shows a schematic cross-sectional view of an exemplary tool spindle with a cup-shaped grinding wheel of the invention which can be driven through two belts and belt pulleys.

Terms are used in the context of this description, which is also used in related publications and patents. However, it should be noted that the use of these terms is only for better understanding. The scope of protection of the spirit and patent claims of the present invention should not be limited by the particular choice of terms in the interpretation. The invention can be easily transferred to other terminology systems and / or technical fields. The terms will be appropriately applied in other technical fields.

2 and 3, the device 20 of the present invention is designed to be equipped with a bevel gear workpiece 31 (here in the form of a stylized crown wheel 31.1). It includes a workpiece spindle (21). In addition, it is a tool spindle 42 for mounting a grinding wheel 24 (here in the form of a cup-shaped grinding wheel) and a plurality of drives for machining the bevel gear workpiece 31 ( For example, reference numerals B1, B2, B3 and other drivers not shown in the drawings). The grinding wheel 24 performs rotation about the rotation axis R1 of the tool spindle 42 during machining of the bevel gear workpiece 31 (the resulting angular velocity is indicated by reference numeral ω1). The grinding wheel 24 engages the bevel gear workpiece 31 to remove material, as shown in FIG. 3 based on a pinion 31.2 with helical teeth. An eccentric movement is superimposed on the rotation about the rotation axis R1, so that the grinding wheel 24 does not continuously remove material using the abrasive outer surface and / or inner surface. . According to the present invention, the grinding wheel 24 is only a bevel gear workpiece 31 at n contact points (also called stroke points) of the entire circle of the abrasive outer surface and / or inner surface of the grinding wheel 24. In contact with, the material of the workpiece is removed from the contact areas.

In Figure 3, the eccentric motion E is schematically illustrated by a double-headed arrow. In principle, the rotating shaft R1 is slightly moved up and down in the axial section of the cup-shaped grinding wheel 24 by the added circular eccentric motion E. Considered in three dimensions, the cup-shaped grinding wheel 24 completes the eccentric motion along a small trajectory, for example, as shown in FIG. 1 (a) and described in connection with this figure.

2 and 3 show a cup-shaped grinding wheel 24 (also called a cup-shaped grinding wheel), on its profile 28 an annular outer surface 28.1 and an annular inner circumferential surface 28.2 ) Is provided. In Fig. 3, the annular outer circumferential surface 28.1 processes the concave serrated flank of the tooth 33, and the annular inner circumferential surface 28.2 processes the convex serrated side of the serration 32 of the pinion workpiece 31.2.

For simplicity, the principle of the present invention is based on the grinding wheels 24 used for cutting one side of concave tooth sides or for cutting one side of convex tooth sides in the following figures. Is explained. The contact points or corresponding contact areas lie on the annular outer circumferential surface 28.1 of the grinding wheel 24 or on the annular inner circumferential surface 28.2. That is, contact points or contact areas are located on the outside or on the inside of the profile 28. Fig. 9 shows an example in which the contact points or contact areas are located on the annular outer peripheral surface 28.1.

In the case of the grinding wheels 24 used according to the invention in two side cuttings, the contact areas are placed on both the outer circumferential surface 28.1 and the inner circumferential surface 28.2, wherein the contact areas of the outer circumferential surface 28.1 are the inner circumferential surface 28.2 ) Are angled and twisted with respect to the contact areas.

The following rules apply in this case:

At one eccentricity (EV), there is only one contact on the outer circumferential surface 28.1 or on the inner circumferential surface 28.2 for one side cutting;

At one eccentricity (EV), for two side cuts there is only one contact on the outer circumferential surface 28.1 and on the inner circumferential surface 28.2, where the contact points are twisted angularly by 180 °;

At 2 eccentricity (EV), there are only 2 contacts on the outer circumferential surface 28.1 or on the inner circumferential surface 28.2 for one side cutting;

At the eccentricity (EV) of 2, there are two contacts on the outer circumferential surface 28.1 and on the inner circumferential surface 28.2 for two side cuttings, where the contact points are twisted angularly by 90 °. The contact points of the outer circumferential surface 28.1 are, for example, 0 ° and 180 °, and the contact points of the inner circumferential surface 28.2 are, for example, 90 ° and 270 °.

These laws can be generalized as follows:

-For one side cutting, the eccentricity (EV) specifies in principle the number of contact points of the outer circumferential surface (28.1) or inner circumferential surface (28.2) per full revolution. More precisely, the eccentricity (EV) is the average value of the number of cuts per revolution or simply the ratio of cuts per revolution;

-In the case of two side cuttings, the eccentricity (EV) directly specifies the number of contact points of the outer circumferential surface 28.1 and the inner circumferential surface 28.2 per rotation, wherein the contact points of the outer circumferential surface 28.1 are the inner circumferential surface 28.2 Are twisted at an angle to each other by 360 ° / 2 * EV with respect to the contact points of. The contact point of the inner peripheral surface 28.2 is always followed by the contact point of the outer peripheral surface 28.1.

During machining, the grinding wheel 24 and the bevel gear workpiece 31 engage with each other, as schematically shown in FIG. 3, for example. In the case of the crown wheel 31.1 (see Fig. 2), the grinding wheel 24 is plunged into the bevel gear workpiece 31. In the case of the pinion 31.2 (see Fig. 3), the grinding wheel 24 and the bevel gear work piece 31.2 roll together.

This approach is known, for example, from published application DE 2721164 A in Germany. The tooth profiles of the teeth 32, 33 are produced on a bevel gear work piece 31.2 by a known rolling process, in which the right and left sides of the tooth gap in the example shown are two side cuts. At the same time it is processed according to grinding. Fig. 3 shows how the tooth gap is machined between the teeth 32, 33 of the bevel gear workpiece 31.2 when shown. The profile area 28 of the grinding wheel 24 that engages in the tooth gaps forms a tooth shape in the longitudinal direction of the tooth. The cutting motion of the grinding wheel 24 relative to the material of the bevel gear work piece 31.2 causes removal of the material in a known manner.

To the described rotational motion, an eccentric motion E is added, as described in relation to FIGS. 1, 2 and 3. This eccentric motion E can be seen in FIG. 3 (projected on the plane of the drawing). Preferably, the rotational motion including the eccentric motion E and any possible other motions is controlled by the CNC controller 50, so no mechanical motion control / adjustment is required. The CNC control device 50 is shown in FIG. 2. Arrows I1 and I2 indicate control connections of the CNC control device 50 to the drive motors B1 and B2 of the present device 20. In addition, depending on the state and stage of processing, there may be other movements of the axes of the device 20, which are well known in the art and are not shown in the drawings.

The eccentric motion may be added by the CNC control device 50 at the correct angle of the rotational motion ω1 of the grinding wheel 24. The CNC control device 50 in FIG. 2 is capable of emitting an eccentric signal E1 that controls eccentric motion as the CNC control device 50 acts on the eccentric drive portion B3 of the tool spindle 42, for example. It is schematically indicated by the arrow E1 leading from to the tool spindle 42.

In the absence of additional eccentric motion (E), the outer and / or inner grinding sides of the grinding wheel 24 (here cup-shaped grinding wheel) (also referred to as the outer circumferential surface 28.1 and the inner circumferential surface 28.2) are the workpiece ( 31) and in a circular direction along the circular arc segment. Accordingly, as described at the beginning, the risk of a grinding burn on the workpiece 31 will be high, so the user can only work with reduced infeed, for example.

The apparatus 20 is specifically designed according to all embodiments of the present invention, the first machining step defined by n contact points of the entire circle (e.g., step I shown in FIG. 4A) ) Afterwards, in order to predefine m contact points of the entire circle of the grinding surface (s) in the range of further machining steps (e.g., step II shown in Fig. 4B), the eccentric motion E can be adjusted. Do. The m contact points differ from the n contact points by an angular distance [Delta] [phi], which relates to the grinding wheel 24. That is, the m contact points are twisted at an angle by an angular distance Δφ with respect to the n contact points.

This principle will be explained below on the basis of Figs. 4A and 4B. The grinding wheels 24 are shown here as being used in one side cutting. Only the outer circumferential surface 28.1 of the grinding wheel 24 is shown in a circle. The grinding wheel 24 is fixedly connected to the tool spindle 42 in all embodiments of the invention at a specified angle. Preferably, a positioning portion 44 is used here, for example arranged on a tool spindle 42 and coupled to the groove 26 of the grinding wheel 24 as schematically shown in FIG. 2. Preferably, the positioning section 44 is designed such that in all embodiments the grinding wheel 24 can only be connected at a fixed angle in a twist-locked manner to the tool spindle 42.

Here, the eccentricity is the first machining step such that the grinding wheel 24 only contacts the workpiece 31 at the 0 ° position (corresponding to the 12 o'clock position) and the 180 ° position (corresponding to the 6 o'clock position) of the grinding wheel 24. It is predetermined (for example, by specifying the eccentricity (EV) = 2) for (eg, step I shown in FIG. 4A). For one side cutting, EV = 2 corresponds to two contacts of the outer circumferential surface 28.1 per revolution or inner circumferential surface 28.2 per revolution. These contact points (stroke points) are fixed relative to the grinding wheel 24 and are identified as P1.1 and P1.2 in FIG. 4A. The active contact points P1.1 and P1.2 are shown in FIG. 4A as circles filled with black. After the first machining step is finished, the grinding wheel 24 is used in a further machining step (either immediately or after a predetermined time), for example, as shown in Figure 4B. In order to prevent the grinding wheel 24 from being effectively stressed again at the same contact points P1.1 and P1.2 in a further machining step, new (different) effective contact points P2.1 and P2. 2) is specified. These effective contact points P2.1, P2.2 are indicated in FIG. 4B by a triangle filled with black. The contact points P1.1, P1.2 (also referred to as inactive contact points) have been used previously and are shown in FIG. 4B as circles filled with white. In the example shown in Figures 4a and 4b, the effective contact points P1.1, P1.2 are used in the first processing step n = 2, while the effective contact points P2.1, P2.2 are 2 Used in processing step m = 2. At this time, the angular distance (Δφ) is 90 °.

In principle, there are two possibilities as to how the adjustment of the angular distance Δφ of the stroke movement can be performed in the grinding machine (device 20). If the eccentricity is fixedly settable with respect to the tool spindle 42, then in the example according to FIG. 4A, the tool spindle 42 has the effective stroke points of n = 2 at 0 ° of the tool spindle 42. It will be specific to the position and 180 ° position. If the grinding wheel 24 is connected in a rotationally-fixed manner to the tool spindle 42 (e.g., by means of a positioning 44 coupled to the groove 26), the stroke points are The corresponding contact points P1.1 and P1.2 are at the 0 ° position and the 180 ° position of the grinding wheel 24, as shown in FIG. 4A. If the eccentricity in the second machining step is again fixedly specified with respect to the tool spindle 42 at the 0 ° and 180 ° positions of the tool spindle 42 (ie, the effective stroke points are again at 0 ° and 180 °), The grinding wheel 24 must be twisted by an angular distance Δφ = 90 ° to the tool spindle 42 before the second machining step. That is, the grinding wheel 24 must be disengaged from the tool spindle 42 to be twisted 90 ° and fixed again. For example, an additional groove 26 must be provided on the tool spindle 42 so that the grinding wheel 24 can be chucked on the tool spindle 42 twisted by 90 °. After this 90 ° twist, the effective contact points P2.1 and P2.2 of the grinding wheel 24 coincide with the effective stroke points of the tool spindle 42 at 0 ° and 180 °.

It is clear that this approach is complex and unsuitable or just limits the suitability for the automated device 20. Further, in this case, the positioning 44 and / or the groove (s) 26 is a stepwise (eg indexed) twist of the grinding wheel 24 on the tool spindle 42. And to be fixed.

Accordingly, an approach according to the invention has been developed in which it is not necessary to separate the grinding wheel 24 from the tool spindle 42 to adjust the angular distance Δφ.

According to the present invention, an eccentric movement, such as a cyclic rotational movement, is added to the main rotation (also referred to as a rotating movement) of the grinding wheel 24 around the rotation axis R1, so that material contact, i.e., removal, is eliminated. Each at precisely predetermined angular positions. Cyclic rotational motion is considered to be a circular motion around the eccentric axis. The eccentric axis is perpendicular to the plane of the drawing in Fig. 1 (a) and penetrates point M2. The eccentric shaft runs parallel to the rotating shaft R1 in all embodiments. The distance e is between 0.05 mm and 1 mm in all embodiments. Particularly preferably, the distance e is between 0.05 mm and 0.5 mm in all embodiments.

According to the invention, the eccentric movement is quasi-synchronized or fixed relative to the grinding wheel 24, i.e., the CNC controller 50 is for example the contact point P1 of the grinding wheel 24 .1) is always "know" whether the upper space-fixed 12 o'clock position is located. In the specific tasks of the present invention, the two speeds and the angular positions (grinding wheel, eccentricity) are preferably synchronized according to the eccentricity (EV), where the speed is a reference variable. The speed and angular position are signaled through a rotary encoder (tap). If an offset from 1 to 2 will be obtained, the offset is applied to the rotation of the eccentric drive and the speed is then kept constant again.

In the example shown in FIG. 4A, in one embodiment of the present invention, for example, the CNC control device 50 has a contact point (P1.1) or a contact point (P1.2) of the grinding wheel 24 at the top. In the space-fixed 12 o'clock position, an eccentric signal E1 is output. Thus, the grinding wheel 24 makes eccentric motions of EV = n = 2 per full rotation of the grinding wheel 24. In the example shown in FIG. 4B, for example, the CNC control device 50 has a contact point (P2.1) or a contact point (P2.2) of the grinding wheel 24 in the upper space-fixed 12 o'clock position. If it is located at, the eccentric signal E1 is output. At these moments, the contact points P1.1 that were previously valid during phase I are at the spatially-fixed 9 o'clock position or at the spatially-fixed 3 o'clock position, respectively. At these moments, the contact points P1.2 that were in effect during the phase I are at the spatially-fixed 3 o'clock position or at the spatially-fixed 9 o'clock position, respectively. The ineffective contact point (P1.1) leads to a current effective point (P2.1) by 90 ° and the ineffective contact point (P1.2) is a current effective contact point (P2.2) by 90 °. Follow. The grinding wheel 24 makes eccentric movements of EV = m = 2 per full rotation of the grinding wheel 24 in step II.

Preferably, in all embodiments, the zero point (ie, zero position) may be specified in the (angle) subdivision. In the exemplary embodiments in FIGS. 4A, 4B, and subsequent figures, the zero point is always set at the spatially-fixed 12 o'clock position above. Depending on the application, this zero point may be placed at any other angular position.

Ideally, in all embodiments, the zero point is located at an angular position established by interlocking of the corresponding actuating means of the device 20. In the example according to Figs. 2 and 9, the positioning portion 44 and the groove portion 26 are used as corresponding operating means.

It is particularly preferred that the embodiments are used to generate two CNC-controlled driving parts B1, B3 with rotation about the rotation axis R1 and an auxiliary motion (eccentric motion) synchronized thereto. There are the following configurations, which can be selected according to the required precision, structural shape, and performance of the device 20:

a) Two coaxially arranged drive parts B1 and B2 are used, all of which are controlled by the CNC control device 50. Each such drive unit is provided with an angle decoder, which can be decoded by the CNC controller 50 or sends signals to the CNC controller 50 through the current angular position and / or speed. To deliver. The two drives B1, B3 are preferably arranged coaxially to be nested in all embodiments. Since the two drives B1, B3 are arranged coaxially in or on the tool spindle 42, this configuration has a relatively large moving mass that must be accelerated during the execution of the eccentric motion.

b) Two drives B1, B3 are used, which are connected to the tool spindle 42 via belts 45, 46, for example, as shown in FIG. The driving unit B1 drives the belt pulley 46.1 connected to the spindle body 42.1 by the belt 46. The driving unit B1 causes the belt pulley 46.1 and thus the spindle body 42.1 to rotate about the rotation axis R1 through the belt 46. The driving unit B3 drives the belt pulley 45.1 connected to the eccentric bush 47 by the belt 45. The advantage of the configuration with two belts 45, 46 is that the tool spindle 42 can be mounted to be movable in the device 20, and the belts 45, 46 can be used for small eccentric movements. It is to compensate.

The configurations according to a) and b) can be combined as follows.

c) The eccentric drive (B3) is installed directly on the tool spindle (42) and the drive (B1) is a drive connection to the drive body (42.1) via the belt (46) and the belt pulley (46.1) (similar to Figure 10) ). The eccentric drive portion B3 may have a direct drive connection to the eccentric bush 47.

d) Alternatively, the drive portion B1 is installed directly on the tool spindle 42 and the eccentric drive portion B3 is driven to the eccentric bush 47 through the belt 45 and the belt pulley 45.1 (FIG. 10 and Similar).

In each case, the driving units B1 and B3 are CNC-controlled to cause a desirable superposition of the eccentric movement according to the interaction with time and the rotational movement around the rotational axis R1. It is controlled by 50.

Preferably, the interaction of the drives B1, B3 over time is caused in all embodiments by the CNC controller 50 such that the speeds n1, n3 and relative angles are specified and controlled. In this case, n1 is the main velocity and n3 is the eccentric velocity. Alternatively to the speeds n1, n3, a speed ratio (DV) = n3 / n1 may be specified.

Specifically, this means that the spindle body 42.1 comprising, for example, the spindle 42 or the tool adapter 42.2 performs a rotational movement about the axis of rotation R1 with the main speed n1. The following conditions apply: ω1 = 2πn1. If the speed n3 of the driving unit B3 is currently set to n3 = n1 (DV = 1 = EV), due to eccentric mounting of the spindle body 42.1 in the eccentric bush 47, at this time, one eccentric stroke Occurs per revolution of the tool spindle or the grinding wheel 24 fixed with a chuck thereon. If the speed n3 of the driving unit B3 is currently set to n3 = 2 * n1 (DV = 2 = EV), two eccentric strokes occur per rotation. The speed ratio DV coincides with the eccentricity EV and specifies the number of eccentric strokes per rotation.

The relative angle should be specified or set to ensure that the eccentric strokes always occur at the desired points relative to the grinding wheel 24 fixed with the chuck. For example, for the very schematic drawings A1 to A7 of Fig. 8, this means that the contact points P1.1 and P1.2 of the grinding wheel 24 reach the spatially-fixed 12 o'clock position. This means that an eccentric stroke should occur when it is done. Fig. 8 shows the outer circumferential surface 28.1 of the grinding wheel 24 shown only in circles, as in Figs. 4A and 4B. Also, it should be noted that the drawing in FIG. 8 is intentionally simplified in that the circular eccentric motion is replaced by a simple vertical motion. In practice, the illustrated circle 28.1 will perform some circular motion as described in relation to Figure 1 (a).

Only the contact points of the outer circumferential surface 28.1 may be considered here. The speed n3 of the driving unit B3 is set to n3 = 2n1 (DV = 2 = EV), so that two eccentric strokes occur per rotation. Also, the relative angle is specified in this example such that the eccentric strokes take place in the space-fixed 12 o'clock position.

In FIG. 8, the maximum stroke H is shown, which can be thought of as a measure of the displacement of the contact points of the outer circumference or outer surface 28.1 of the grinding disc 24. The stroke H is not necessarily equal to the distance e. If the eccentric strokes are achieved by circular parallel displacement / movement of the rotation axis R1, then H = e accordingly.

Preferably, the grinding wheel 24 is subdivided (virtually or actually) into angular sections in all embodiments. Also, these sections may have other configurations. Thus, the grinding wheel 24 may include sections with a higher removal rate material, for example for roughing. Other sections of the grinding wheel 24 can be coated with a material, for example, to obtain surfaces with higher surface quality. When subdivided into angular sections, it is considered that the point of contact that comes into contact with the material of the workpiece 31 is actually an arc segment (i.e., contact area). Only the points of contact are theoretically possible.

The larger the diameter of the grinding wheel 24 and thus the farther the contact points and arc segments (contact areas) are formed from the axis of rotation R1, the more arc segments are annular 360 ° full circumference (U1 = 2πr1). This principle will be explained based on FIG. 5. 5 shows a view of the cup side of the grinding wheel 24. The grinding wheel 24 has an outer diameter of 2 * r. The inner diameter of the profile 28 is indicated by a circle K1 as 2 * r1. The outer circumferential surface 28.1, the inner circumferential surface 28.2, and the head surface 28.3 of the profile 28 can be seen in FIG. 5. The outer circumferential surface 28.1, the head surface 28.3, and the inner circumferential surface 28.2 are positioned as viewed from the outside to the inside. At this time, the head surface 28.3 is in the plane of the drawing, and the outer circumferential surface 28.1 and the inner circumferential surface 28.2 are inclined (conical).

The contact points P1.1, P1.2 are shown in Fig. 5, all of which lie on a circle K1 having a radius r1 less than the radius r. The grinding wheel 24 is assumed to be designed for one side cutting of the convex toothed sides 5.2 of the work piece 31.

Further, from Fig. 5, if the arc segments S1 and S2 are seamlessly contacting each other and if the arc segments S1 and S2 are each formed with the same length, two adjacent contact points P1. It can be inferred that the angular distance of 1, P1.2) coincides with the absolute value of the angle φ1 assigned as the arc length s1.

In addition, since the eccentric motion is a cyclic motion, the periodicity must be maintained according to the setting of contact points or angular positions related thereto. If periodicity is provided for the full rotation, it can be ensured that the same positions of the grinding wheel 24 will come into contact with the contact points again and again even after a plurality of rotations.

Preferably, the device 20 is designed so that in all embodiments the following procedure is used to set the contact points. The required arc length s1 of the arc segment S1 is generated from processing parameters, for example s1 = 1 cm. The diameter or radius r1 of the circle K1 is known (specified by the tool 24). In addition, the angular resolution (Δφmin) of the device 20 is known. Here, it is assumed that the angular resolution (Δφmin) = 1 °. Theoretically, 360 contact points can be included on the entire circle, for example with angular resolution. At a predetermined length of s1 = 1 cm, the circumference U1 of the circle K1 should be formed to be at least 360 cm to include circular segments of length 360 x 1 cm. The radius r1 of this circle K1 will be 57.3 cm.

Subdividing a given grinding wheel 24 into an appropriate number of arc segments can be performed based on corresponding arc and angle calculations. For example, if 36 circular arc segments each having an arc length of 2 cm (s1) (i.e., the minimum required arc length is s1 = 2) should be included on the grinding wheel, the circle (K1) is at least 11.46 cm. The radius r1 is required. For example, to include 36 arc segments each 2 cm, if the user takes a radius r1 = 12 cm, an effective arc length of 2.09 cm is created. The effective arc length of 2.09 cm is greater than the required arc length of 2 cm. Therefore, the characteristic that the arc length should be at least 2 cm is satisfied. If the device 20 has an angular resolution of 1 °, it should now be checked whether it is possible to subdivide the entire circle into 36 arc segments. The 36 circular arc segments each cover an angle φ 1 of 10 °. The angle φ1 can be completely divided by an angle resolution of 1 °. This means that the center contact points of the 36 circular arc segments can be set reproducibly and accessed accurately and periodically.

Subdividing the grinding tool 24 into 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, etc., if the angular resolution (Δφmin) of 1 ° is specified It is particularly appropriate. In practice, in most cases, there are significantly fewer subdivisions than those listed above as examples.

If an angular resolution of 0.5 ° (Δφmin) is specified, additional numbers, such as 16, are added, providing an additional example.

According to the present invention, it is required that the angular distance Δφ ≥ Δφmin. Further, when the numbers (n, m) are integers greater than 2 and the selected number (n or m) is multiplied by Δφmin, it becomes a 360 ° value or an integer divisor of 360 °. In addition, it will always be ensured that the effective calculated length of the arc segments is greater than the minimum arc length s1 required based on process variables. If this last condition is met, there is always a small angular distance as a safety distance or reserve between adjacent arc segments.

On the other hand, in order to ensure a sufficient spatial (angle) distance, it is also possible to include a margin in the minimum arc length s1 required based on the process parameters. Thus, if the required minimum arc length s1 is, for example, 1.5 cm, this value can be rounded up to 2 cm, for example. If the calculations described above are performed using, for example, a value of 2 cm, a mutually angular distance of adjacent arc segments or contact points, which provides a sufficient safety distance or reserve, is always achieved.

Preferably, the grinding wheel 24 is subdivided into an integer number of arc segments S1, S2, etc. of the outer circumferential surface 28.1 and / or the inner circumferential surface 28.2 in all embodiments and the CNC control 50 is eccentric A circular arc at angular positions where all contact points (P1.1, P1.2, P2.1, P2.2) can be specified (meaning configurable and accessible) respectively on the machine by controlling the movement. It is located in the segments S1 and S2. The angular positions that can be specified in this machine depend on the system-side angular resolution (Δφmin). The angular positions that can be specified in this machine should be integrally divided by the angular resolution (Δφmin).

FIG. 6 shows an example of a grinding wheel 24 whose inner circumferential surface 28.2 is subdivided into six arc segments S1 to S6. The arc segments S1 to S6 are represented by thick arcs of the circle K1 having a radius r1. These are distributed equidistantly over the entire circle. The contact points P1.1 to P3.2 are arranged at the angular center of each arc segment S1 to S6. Each arc segment has an arc length s1, which is slightly shorter than the total circumference of 360 ° divided by the number of arc segments. Thus, the intermediate spaces are shown shaded here and are formed between the six arc segments S1 to S6. This means that the six arc segments S1 to S6 do not overlap or meet each other and are twisted with respect to each other by a few degrees.

The grinding wheel 24 according to FIG. 6 can be used, for example, in the machine 20 of the present invention as follows. Thereafter, one side cutting is assumed in which only the inner circumferential surface 28.2 of the grinding wheel 24 is used. For example, in the first processing step (I step), the contact points P1.1 and P1.2 can make contact with the material of the work piece 31, respectively. Here, the condition n = 2 applies, which means that two contacts on the inner circumferential surface 28.2 occur per revolution of the grinding wheel 24. For example, in the second processing step (step II), the contact points P2.1 and P2.2 can each make contact with the material of the work piece 31. Here, the condition m = 2 applies. For example, in another further processing step, the contact points P3.1, P3.2 can each make contact with the material of the workpiece 31. Here, the condition k = 2 applies.

The granulation / splitting of the grinding wheel 24 occurs quasi-virtually, so the present invention allows expansion. This segmentation is carried out according to the invention so that the contact points in the segments can be repeatedly approached with angular precision. For example, the virtual segmentation / segmentation of the grinding wheel 24 into the roughing and finishing areas of arc segments of the abrasive outer peripheral surface 28.1 and / or the inner peripheral surface 28.2 of the grinding wheel 24. Allow physical partitioning.

Therefore, the principle shown in FIG. 6 can be refined as follows. Since more material must be removed on the workpiece 31 during roughing, roughing in the illustrated embodiment is assigned to a larger surface area of the grinding wheel 24. A corresponding example of a grinding tool 24 is shown in FIG. 7, where only a circle K1 having a radius r1 is shown in a schematic drawing of the tooth profile 28 of the grinding wheel 24. The grinding wheel 24 has two large arc segments between approximately 7 and 11 o'clock and between 2 and 5 o'clock. Corresponding arc segments are identified as S1, S2, S3 and S4. Each of the arc segments S1 to S4 is assigned a contact point P1.1 to P1.4, respectively. Here, the arc segments S1 to S4 are represented by a curve with a thick dot, which is the arc segments S1 to S4 of this grinding wheel 24 designed for roughing, that is, the outer circumferential surface 28.1 and This is because the corresponding sections of the inner circumferential surface 28.2 will be designed for roughing. The two remaining arc segments S5 and S6 are represented by corresponding thick solid curves. Two contact points P2.1, P2.2 are assigned to these two arc segments S5, S6. The arc segments S5, S6 are used for finishing, ie the corresponding sections of the outer circumferential surface 28.1 and / or the inner circumferential surface 28.2 are designed for finishing. Sections of the arc segments S5, S6 or the outer circumferential surface 28.1 and / or the inner circumferential surface 28.2 may be coated with arc segments S1 to S4 or grains different from the corresponding sections, respectively. The shaded segments between the mentioned segments are used as safety distances or reserves as already described.

Here, it should be noted that the shaded segments of the grinding wheel 24 should not be physically present on the tool. These are rather hypothetical intermediate or transition segments. Preferably, in all embodiments the intermediate or transition segments of the grinding wheel 24 are not visible. However, if necessary, intermediate or transition segments can be identified (eg, by color) on the grinding wheel 24.

The grinding wheel 24 according to FIG. 7 can be used, for example, as follows. In the first step (step I), the work piece 31 is subjected to roughing using contact points P1.1 and P1.2 (where condition n = 2 applies). After roughing, the roughened side surfaces of the workpiece 31 can be subjected to a finishing operation. During the finishing operation, contact points P2.1 and P2.2 are used. In a further step (e.g., again in the first step on the other work piece 31), this additional work piece 31 is the contact points P1.3, P1.4 (where the condition k = 2 applies) Use to get roughing. After roughing of this additional workpiece 31, the roughened toothed sides may be subjected to a finishing operation. During the finishing operation, the same contact points P2.1 and P2.2 are used as described above.

8 shows a very schematic series of instantaneous views A1 to A7 of the grinding wheel 24, the grinding wheel being eccentrically mounted and two contact points on the outer circumferential surface 28.1 according to the invention (P1.1, P1.2) (EV = 2). Here, the circular eccentric motion is illustrated in FIG. 8 in a simplified form by linear vertical motion. The dotted line L represents the normal position of the upper edge (on the outermost circumference) of the grinding wheel 24. The workpiece 31 to be processed is not intentionally shown in FIG. 8. The grinding wheel 24 rotates counterclockwise as indicated by the arrow ω1 in the instantaneous view A1. The instantaneous view A1 represents a state in which the two contact points P1.1 and P1.2 of the grinding wheel 24 are located at 3 and 9 o'clock in a space-fixed coordinate system. . Now, the grinding wheel 24 rotates by -45 °, reaching the position shown in the instantaneous view A2. Next, the grinding wheel 24 is additionally rotated by -45 ° to reach the position shown in the instantaneous view A3. At the moment when the contact point P1.1 reaches the 12 o'clock position, the tool spindle 42 solidifies with the grinding wheel 24 to produce a stroke motion (also called eccentric motion). Through the linear stroke movement shown here in a simplified form, the grinding wheel 24 is temporarily moved upward by the stroke H. At this time, a part of the grinding wheel 24 is placed on the line L in the instantaneous view A3. After an additional -45 ° rotation, the grinding wheel 24 reaches the position shown in the instantaneous view A4. This will be again below line L when it reaches the position shown in moment A4 at the latest. The grinding wheel 24 further rotates in this way to reach the positions shown in the instantaneous views A5, A6. At the moment when the contact point P1.2 reaches the 12 o'clock position, the tool spindle 42 is engaged with the grinding wheel 24 to make a stroke motion (also called eccentric motion) again. The grinding wheel 24 is temporarily moved upward by the stroke H by the stroke movement. At this time, a part of the grinding wheel 24 is located above the line L in the instantaneous view A7. This exemplary sequence repeats periodically or recursively (regularly reoccurring) in this or other form in all embodiments.

9 shows a schematic side view of a grinding wheel 24 formed in the form of a cup-shaped grinding wheel, wherein the grinding wheel is mounted eccentrically and on the outer circumferential surface 28.1 and / or the inner circumferential surface 28.2 (Fig. 9). In the side view, two contact points P1.1 and P2.1 of the outer circumferential surface 28.1 can be seen. The contact point P1.1 is valid in the illustrated processing step and is therefore marked with a circle filled with black (as also in FIG. 4A). The contact point P2.1 is invalid in the illustrated processing step and is therefore marked with an empty triangle.

10 shows a schematic cross-sectional view of an exemplary tool spindle 42 of the present invention, which can be driven through two belts 45, 46 and belt pulleys 45.1, 46.1. Looking from the inside to the outside, this tool spindle 42 can include a spindle body 42.1 with a continuous central borehole 48 here. The spindle body 42.1 is rotated about the rotation axis R1 by the belt pulley 46.1 and the belt 46. The spindle body 42.1 is mounted to the eccentric bush 47 by spindle bearings 49.1. Next, the eccentric bush 47 is mounted to the outer spindle body 41 by eccentric bearings 49.1. The outer spindle body 41 is rotated in rotation around the virtual rotation axis of the bush 47 mounted eccentrically by the belt pulley 45.1 and the belt 45. These two rotational motions are added to generate the desired periodic stroke motions of the spindle body 42.1 with a grinding tool 24 fixed to the spindle body, which is only schematically shown in FIG. 10.

Preferably, the invention can be used in the case of discontinuous (plunge) grinding of bevel gears and especially of crown wheels (with helix-tooth). All embodiments can be used for this preferred purpose.

Depending on the state or embodiment, condition n ≠ m or condition n = m may be applied.

1 ... crown wheel 2 ... grinding tool / grinding cup
3 ... Waguri wheel 4 ... Zone
5 ... tooth side 5.1 ... concave tooth side
5.2 ... convex tooth side 6 ... tooth
8 ... Profile 8.1 ... Outsourcing
8.2 ... next week 20 ... device
21 ... workpiece spindle 24 ... grinding wheel / cup-type grinding wheel
26 ... Home part 28 ... Area / Profile
28.1 ... Outer surface 28.2 ... Inner surface
28.3 ... Head side 31 ... Bevel gear workpiece
31.1 ... Crown Wheel 31.2 ... Pinion
32, 33 ... teeth 40 ... countermeasures
41 ... outer spindle body 42 ... tool spindle
42.1 ... spindle body 42.2 ... tool adapter
44 ... positioning unit 45 ... belt
45.1 ... belt pulley 46 ... belt
46.1 ... belt pulley 47 ... eccentric bush
48 ... Center bore hole 49.1 ... Spindle bearing
49.2 ... eccentric bearing 50 ... CNC control
A1 to A7 ... instantaneous B1 ... first drive motor
B2 ... second drive motor B3 ... third drive motor
Δφ ... angular distance Δφmin ... angular resolution
DV ... speed factor e ... distance
E ... eccentric motion E1 ... eccentric signal
EV ... eccentricity H ... stroke
I1, I2 ... control connection k ... number of contact points
K1 ... circle k ... number of contact points
L ... line m ... number of contact points
M1 ... wheel center point M2 ... center point
n ... Number of contact points n1 ... (Note) Speed
n3 ... eccentric speed
P1.1, P1.1, P1.3, P1.4, P2.1, P2.2, P3.1, P3.2 ... contact points
Q ... rational number r ... radius
r1 ... radius R1 ... axis of rotation
R2 ... Workpiece rotation axis s1 ... Arc length
S1, S2, S3, S4, S5, S6 ... circular segment
v1 ... cutting speed U1 ... full circumference
ω1 ... Angular velocity X, Y, Z, B, C, A1 ... Drives
X1-X1 ... section

Claims (17)

CNC of the workpiece spindle 21 for mounting the bevel gear workpiece 31, the tool spindle 42 for mounting the grinding wheel 24 provided with abrasive surfaces 28.1, 28.2, and the CNC of the bevel gear workpiece 31 -It is provided with a plurality of driving parts (B1, B2, B3) for controlled machining, the grinding wheel 24 is centered around the rotation axis (R1) of the tool spindle 42 during the machining of the bevel gear workpiece 31 To perform the rotation and the grinding wheel 24 is engaged with the bevel gear work piece 31 to remove material, and an eccentric motion E is added to the rotation about the rotation axis R1 of the tool spindle 42 , A device in which the grinding wheel 24 engages the bevel gear workpiece 31 using only n contact areas P1.1, P1.2 of the entire circle K1 of the abrasive surface 28.1, 28.2 ( In 20),
The device 20 displays m contact areas P2.1, P2.2 of the entire circle K1 of the abrasive surfaces 28.1, 28.2 during the further machining step II after the first machining step I. It is designed to enable the adjustment of the eccentric motion (E) to specify, it characterized in that the m contact areas (P2.1, P2.2) do not overlap with the n contact areas (P1.1, P1.2) Device 20. According to claim 1, m contact areas (P2.1, P2.2) is spaced apart from the angular distance (Δφ) according to the angular twist with respect to the n contact areas (P1.1, P1.2) Device 20, characterized in that they do not overlap, but m is equal to n. Device (20) according to claim 1, characterized in that the device (20) comprises an eccentric tool spindle (42) where the stroke points can be specified relative to the grinding wheel (24). The apparatus (20) according to claim 1, wherein the device (20) comprises a CNC control device (50) for CNC-controlled machining of the bevel gear work piece (31), which enables the angular distance (Δφ) to be specified, Device 20 characterized in that the grinding wheel 24 can be twisted by the CNC control 50 by this distance before the first machining step (I) and before the further machining step (II) starts. Device (20) according to claim 1, wherein a condition of n ≠ m is applied. The grinding wheel (24) is subdivided into an integer number of arc segments (S1, S2, S3, S4, S5, S6) on the control side and the CNC controller (50) has all contact areas (P1). Eccentric motion (E) such that .1, P1.2, P2.1, P2.2 are in arc segments S1, S2, S3, S4, S5, S6 respectively on angular positions that can be machine specific. Device 20, characterized in that for controlling. The grinding wheel 24 is divided into a plurality of arc segments (S1, S2, S3, S4, S5, S6), at least one of these arc segments (S1, S2, S3, S4) Device 20, characterized in that it is designed for roughing and at least one of these arc segments (S1, S2) is designed for finishing. Device (20) according to claim 1, characterized in that the tool spindle (42) is mechanically connected to two drives (B1, B3) arranged coaxially with one another on the rotation axis (R1). Device (20) according to claim 1, characterized in that the tool spindle (42) is mechanically connected to two drives (B1, B3) via belts (45, 46). The CNC control according to claim 1, characterized in that one or more of the speeds (n1, n3) and the speed ratio (DV) of the rotation and eccentric movement (E) of the tool spindle (42) about the rotation axis (R1). Device (20), characterized in that it comprises a device (50). Device (20) according to claim 1, comprising a CNC control (50) designed to specify the relative angular position of the tool spindle (42) and eccentric mounting. Providing a grinding wheel 24 on the tool spindle 42,
And rotating the grinding wheel 24 about an axis of rotation R1 of the tool spindle 42.
Providing a first bevel gear workpiece 31 on the workpiece spindle 21,
And performing a first grinding operation of the first bevel gear workpiece 31 using the grinding wheel 24 such that it is CNC-controlled, but the rotation of the grinding wheel 24 is such that the abrasive surfaces 28.1, 28.2 are only full. Has an eccentric motion E added to mesh with the material of the first bevel gear workpiece 31 at n contact points P1.1, P1.2 of the circle K1,
Comprising the step of performing the CNC-controlled second grinding of the first bevel gear workpiece 31 or the additional bevel gear workpiece using the grinding wheel 24, the eccentric motion (E) is a polishing surface (28.1, 28.2) On the rotation of the grinding wheel 24 to engage the material of the first bevel gear work piece 31 or the additional bevel gear work piece at m contact points P2.1, P2.2 of the entire circle K1 only. In addition, m contact points P2.1, P2.2 are grinding wheels with abrasive surfaces 28.1, 28.2, spaced apart from n contact points P1.1, P1.2. Method for machining bevel gear workpieces using (24). The method of claim 12, wherein the first grinding is roughing and the second grinding is finishing. 13. The method of claim 12, wherein the method is performed on a grinding machine (20) with a CNC control device (50), the CNC control device (50) is at least
The number (n) of the contact areas P1.1, P1.2,
Number of contact areas P2.1, P2.2 (m),
The number of circular segments S1 to S6 of the grinding wheel 24,
Minimum arc length s1 of the arc segments S1 to S6 of the grinding wheel 24, and
Minimum distance between adjacent arc segments S1 to S6 of the grinding wheel 24
A method characterized by providing the possibility to set or select one or more of the above. 13. The method of claim 12, wherein the method is performed on a grinding machine (20) equipped with a CNC control device (50), the CNC control device (50) rotating at least a tool spindle (42) about an axis of rotation (R1). And the possibility of specifying one or more of the speeds (n1, n3) and the speed rate (DV) of the eccentric motion (E). 13. The method of claim 12, wherein the method is performed on a grinding machine (20) equipped with a CNC control device (50), the CNC control device (50) has at least a relative angular position of the tool spindle (42) and eccentric mounting. A method characterized by providing specific possibilities. Use in the device (20) according to any one of claims 1 to 11 designed to carry out the method according to any one of claims 12 to 16 in the case of operation of the device (20). CNC control device for (50).

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